/*
 * Copyright 2014 Google Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not
 * use this file except in compliance with the License. You may obtain a copy of
 * the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations under
 * the License.
 */
package com.google.j2cl.benchmarks.octane.deltablue;

/**
 * Variables that should, with some level of preference, stay the same. Planners may exploit the
 * fact that instances, if satisfied, will not change their output during plan execution. This is
 * called "stay optimization".
 */
class StayConstraint extends UnaryConstraint {

  StayConstraint(Variable v, Strength strength) {
    super(v, strength);
  }

  @Override
  void execute() {
    // Stay constraints do nothing
  }
}
